时间标签：数据日期 2026-10-31 · 生成时间 2026-11-01 05:30（Asia/Shanghai）｜ 检索窗口 PubMed edat 2026/10/28–2026/10/31 ｜ 情报发生日期 2026-10-31
研究问题
The molecular basis of erythropoietin (EPO) resistance remains elusive, underscoring an urgent need to discover novel therapeutic targets capable of both promoting erythroid differentiation and optimizing iron utilization.；Although the AMPK/mTOR axis has been linked to diverse hypoxia-adaptive responses, its functional involvement in erythropoiesis remains inadequately defined.；Accumulating evidence, however, indicates that AMPK activation may influence HIF stability via both canonical PHD/VHL-dependent mechanisms and alternative, non-canonical pathways.
方法
Transfection efficiency was evaluated by Western blotting at 48 h post-transfection.；Protein lysates were quantified using the BCA Protein Assay Kit (Thermo Scientific, 23225), and equal amounts of protein (30 μg per lane) were resolved by 8–12% SDS-PAGE and transferred onto PVDF membranes (Millipore, IPVH00010).；Membranes were blocked for 1 h at room temperature with either 5% non-fat milk (for detection of non-phosphorylated targets) or 5% BSA (for phospho-specific antibodies) in TBST (Tris-buffered saline containing 0.1% Tween-20), followed by overnight incubation at 4 °C with primary antibodies.；Immunoprecipitated proteins were eluted by boiling in 2× SDS sample buffer for 10 min and subsequently analyzed by Western blotting with anti-VHL (2738S, Cell Signaling, 1:1000) and anti-HIF-2α antibodies.
核心结论
As shown in , this resulted in a significant decline in viability to 55.3% ± 6.2% of control at 24 h (P < 0.01).；Time-course analysis revealed progressive decreases at 6 h (12.0%), 12 h (31.7%), and 24 h (52.4%) (all P < 0.01; ).；Western blot analysis demonstrated that anemic stress stabilized HIF-2α protein by approximately 8.0-fold () and activated AMPK (p-AMPK/AMPK ratio increased 3.4-fold) while suppressing mTOR (p-mTOR/mTOR ratio decreased to 0.56-fold) (). ‖ 结论：These findings provide a mechanistic basis for developing AMPK-targeted therapies for anemia, particularly in ESA-hyporesponsive patients, and suggest that the AMPK/mTOR/HIF-2α axis constitutes a promising therapeutic target for disorders affecting erythropoiesis and iron homeostasis.
局限
Increased EPOR expression may sensitize erythroid progenitors to residual EPO, which is particularly relevant in anemic patients with elevated EPO levels but poor response (; ).；Nevertheless, caution is warranted, as excessive HIF-2α stabilization has been linked to adverse outcomes.；The therapeutic window for AMPK-targeted interventions in anemia may be narrow, and future studies should explore intermittent or cell-type-specific targeting strategies.
对本项目的价值
★☆☆☆☆ 营养感知与自噬轴决定「干预窗口 + 剂量方案」，是组合疗法的时间锚。
全文来源
PMC JATS 全文（正文 29,305 字符，已过标题/DOI 逐字归属校验）
原文题录
- 英文标题：AMPK activation stabilizes HIF-2α by disrupting VHL binding and promotes erythroid differentiation under anemic stress via the mTOR pathway.
- 期刊与标识：Front Physiol · PMID 42964228 · DOI 10.3389/fphys.2026.1932780
A 级证据分级：A 级（同行评议人体研究）
本文属人体研究证据，但需注意：观察性或小样本干预的结论不等于已证实临床获益；效应量与长期安全性仍需更大规模、更长随访的试验验证。
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